Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Detent Downshift Control

The 3-2 downshift control valve regulates timing of the 3-2 detent downshift by requiring line pressure of at least 110 psi before allowing T.V. pressure to enter the 3-2 downshift passage. When the minimum line pressure has been reached, pressure is applied to the passage and the combination of T.V. pressure and downshift pressure is applied to the 2-3 shift valve. This pressure opposes governor pressure applied to the opposite side of the shift valve to downshift the transmission.